VS 1995 DUAL FUEL BACKFIRING ON lpg GAS

[DONHOMER]

VS 1995 DUAL FUEL BACKFIRING ON GAS,my vs has started backfiring on gas has happened a couple of times in the past after driving for say 1 hour turning off car and restarting it will bang once then be ok .last nite I was driving along peacefully all of a sudden bang the engine cut out at stkilda junction,scared the shit out of me,I put it in neutral and rolled to the side of the road.got out had a look under car for any engine/auto parts on ground,all clear,started it up and drove home.Had a look this morning,started it up drove around block then bang again,this is when I knew it was the gas.runs fine on petrol.Does it need aTune up?any other ideas.cheers

[DavoVP]

Yep take it to the gas shop. Could be tune, Plugs, Leads, Coils

They are the most common things to make a car go bang on LPG. I have a VP commodore on gas and it used to blow the air box without fail once a week. After working through the list above it turned out to be a coil, Replaced it and haven't had an issue since.

[strgas]

start with the base tune plugs leads coils check for vac leaks and split hoses incorrect sealing of mixer any other dislodge hoses or wiring connections

[peter1]

my brothers did the same backfiring on gas only found it was the coils after he replaced spark plug and leads

[bogan_vk]

did you check your airbox ? when gas backfires it usually cracks or blows a hole in your airbox.

[Spudz]

Mine did this too, blew a hole in the hose from the engine to the airbox

[DONHOMER]

Fixed my VS ,put new plugs ,leads and middle coil,no difference.Turned out to be crank angle sensor faulty ,affecting advance and retard of distributer,got new senor fitted, runs great now.cheers